chips:74157
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chips:74157 [2005/11/15 21:45] – nfg | chips:74157 [2005/12/14 23:58] – Added useful table. nfg | ||
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===== 74157 IC ===== | ===== 74157 IC ===== | ||
- | The 74157 is a quad 2-line to 1-line multiplexer. Basically how this works is there are two inputs ( A and B ) for every output ( Y ). There are four groups like this, with two inputs and one output. There is one select signal for the whole chip. When the select signal is low, the output ( Y ) is the same as input A. When the select signal is high, the output Y is the same as input B. | + | The 74157 is a quad 2-line to 1-line multiplexer. Basically how this works is there are two inputs ( A and B ) for every output ( Y ). There are four groups like this, with two inputs and one output |
- | **Note:** The buttons below correspond to SNES buttons. | + | {{chips: |
- | + | ||
- | {{ chips:ic-74157.png}} | + | |
^ IC 1 ^^^^ | ^ IC 1 ^^^^ | ||
^ Pin ^ Function ^ Function ^ Pin ^ | ^ Pin ^ Function ^ Function ^ Pin ^ | ||
- | | | + | | 1 | Select |
- | | | + | | 2 | 1A |
- | | | + | | 3 | 1B |
- | | | + | | 4 | 1Y |
- | | | + | | 5 | 2A |
- | | | + | | 6 | 2B |
- | | | + | | 7 | 2Y |
- | | | + | | 8 | Gnd |
** UNFINISHED! ** | ** UNFINISHED! ** |
chips/74157.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1